Why doesn't Nvidia Optimus work with G-Sync?

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Boredommadness

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Apr 28, 2016
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I read somewhere that you won't really find any laptops that have G-Sync displays and have the Optimus technology at all. And I know the Optimus offers better battery or something like that, not sure. Can I please get some enlightenment here?
 
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Solandri
In an Optimus laptop, the Intel integrated GPU always drives the screen. The Nvidia GPU shows up as a co-processor. A game will use the Nvidia GPU to draw a frame. This frame is then sent to the Intel GPU for display (basically vsync is always on).

Intel integrated GPUs don't support G-sync (nor refresh rates above 60 Hz I think).

Some gaming laptops work around this problem by hooking the Nvidia GPU up directly to their screen, or to the miniDisplayport out, or both, and support G-Sync that way (thus obviating the need for Optimus). This will degrade battery life, so there's usually a BIOS setting which lets you select if the Intel or Nvidia GPU will drive the screen. They're very rare though, and their advertising makes it a...
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Solandri

Solandri

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Jan 4, 2012
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In an Optimus laptop, the Intel integrated GPU always drives the screen. The Nvidia GPU shows up as a co-processor. A game will use the Nvidia GPU to draw a frame. This frame is then sent to the Intel GPU for display (basically vsync is always on).

Intel integrated GPUs don't support G-sync (nor refresh rates above 60 Hz I think).

Some gaming laptops work around this problem by hooking the Nvidia GPU up directly to their screen, or to the miniDisplayport out, or both, and support G-Sync that way (thus obviating the need for Optimus). This will degrade battery life, so there's usually a BIOS setting which lets you select if the Intel or Nvidia GPU will drive the screen. They're very rare though, and their advertising makes it a point to boast that they have this capability.
 
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